SLO County weather forecast for the week of June 17

Here is this week’s weather forecast by PG&E meteorologist John Lindsey.

Weather report

A 1,028-millibar Eastern Pacific High about 700 miles to the west of San Luis Obispo, combined with a 1,007-millibar low-pressure system over the desert Southwest will produce a steep pressure gradient along the Central Coast. This pattern will produce moderate galeforce to fresh gale-force (32- to 46-mph) afternoon northwesterly winds along the coast today through Thursday.

This morning’s marine low clouds will quickly give way to mostly clear skies throughout San Luis Obispo County, including the beaches.

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Today’s temperatures will rise to the low 90s in the North County and mid-70s in the coastal valleys.

Temperatures at the beaches will reach the low 60s along the northwesterly facing beaches (Morro Bay, Los Osos, Montaña De Oro and the Nipomo Mesa); the mid-60s along the westerly facing beaches (Pismo, Grover Beach and Cambria); and the high 60s along the southwesterly facing beaches (Cayucos, Avila and Shell beaches).

Windy conditions with clear skies and mild temperatures will continue through Thursday.

High pressure will build over the Central Coast on Friday. This condition will produce decreasing northwesterly winds, warmer temperatures and return of night and morning coastal low clouds and fog.

The warming trend will continue over the weekend with temperatures generally getting to slightly above normal levels with 90s to around 100 expected for the North County. Slightly cooler weather is then forecast for early the following week with warmer weather possible again toward the end of the month.

Today’s surf report

Batten down the hatches, increasing northwesterly winds along the California coast will produce 5- to 7-foot northwesterly (320-degree shallow-water) seas (with a 4- to 6-second period) today and Tuesday, building to 8 to 10 feet (with a 5- to 7-second period) Wednesday through Thursday. Rough indeed!

A 5- to 7-foot northwesterly (300-degree deep-water) sea and swell (with a 5- to 9-second period) will develop along our coast Friday, decreasing to 4 to 6 feet Saturday through Sunday.

Arriving from the Southern Hemisphere:

A 1- to 2-foot Southern Hemisphere (185-degree deep-water) swell (with a 16- to 19-second period) will arrive along the Central Coast on Wednesday and Thursday.

Water temperatures

A tremendous amount of upwelling along the Central Coast will result in frigid seawater temperatures. Seawater temperatures will range between 53 and 55 degrees through Tuesday, decreasing to between 49 and 51 degrees Wednesday through Friday.

John Lindsey’s Weekly Forecast is special to The Tribune. His Weather Watch column appears in the Local section on Sundays. Email him at pgeweather@pge.com.